A depiction of the storming of San Juan Hill from the Spanish-American War

In the 1890s, the belief that Americans should avoid getting involved with other countries was slowly fading. Because of its rapid economic and social growth, the U.S. had become a major world power. So when Cuban rebels began a violent revolution against Spanish rule in 1895, and a mysterious explosion sunk the U.S.S. Maine in the Havana harbor, the U.S. entered into what diplomat John Hay called "a splendid little war" with Spain. Although the Spanish-American War ended relatively soon, issues over ownership of the Philippines, Puerto Rico, and the Hawaiian islands also had to be resolved.